For U.S. consumers, going solar is usually a major undertaking, involving tens of thousands of dollars, months of logistics, a slew of financing options, and ever-changing incentives. But in Germany, upwards of a million customers — homeowners and renters alike — are simply plugging in small, affordable solar arrays to standard power outlets. These small systems are, by law, 800 watts or less, a fraction of the size of a typical rooftop solar system in the U.S. Often called “balcony sol...
